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If an area's previous population was ninety lakh and current population is ninety-nine lakh, what is the growth percentage?

Answer and explanation

Correct answer: Ten percent

Direct answer: B, ten percent. First find the absolute increase: current population minus previous population = 99 lakh − 90 lakh = 9 lakh. Next compare this increase with the previous, or base, population: growth percentage = (increase ÷ previous population) × 100. Therefore, (9 ÷ 90) × 100 = 0.1 × 100 = 10%. B is correct. A, 5%, is half the actual percentage. C, 9%, incorrectly treats the number nine as the percentage without comparing it with the base of 90. D, 20%, is too high and does not follow the formula. The base must be the earlier population, not the current population or the increase alone. Memory cue: subtract first, then divide by the old population and multiply by 100.

Related tags

Growth PercentageAbsolute GrowthBase PopulationCalculationPopulation GrowthPopulationGeographyClass 9 Mcq

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